pulling at ears during nap

Meredith • Mother to my rainbow baby girl 10/21/16 and 1 on the way due 1/4/19 🌈🌈
Over past 3 days or so I've noticed my 6 mo old pulling at both ears while trying to go down for nap. She's fussing while doing it but I can't tell if she's in pain or just trying to soothe herself.
She does eventually fall asleep.  She has no other symptoms and has not been sick. Ideas appreciated!